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Nutrients, pH, and organic matter were determined in water samples collected from the Raba River above Dobczyce Reservoir (meso-eutrophic), from the Dunajec River above Czorsztyn Reservoir (mesotrophic), and Rożnów Reservoir (eutrophic), and in the bottom sediments of the reservoirs. The river waters were alkaline (pH 7.2-9.2). In the Raba River and Dunajec River, the ranges of nutrients and organic matter contents were similar (without significant differences) (in mg dm-3; N-NO3 0.5-2.5, N-NH4 0.2-2.0, N-NO2 0.004-0.040, N-tot 1.1-5.6, PO4 0.02-0.58, P-tot 0.03-1.9, while BOD5 1.6-9.9 mg dm-3 O2, COD 2.1-30.4 mg dm-3 O2). The pH of reservoir sediments was from neutral to slightly alkaline (6.9-7.6). The sediments were mineral and were characterized by a low amount of nutrients (N-tot 0.04-0.36%, P-tot 0.007-0.185%) and organic matter (expressed as LOI 3.0-10.6%, TOC 0.9-3.3%). Nutrient (except P-tot) and organic matter contents in the sediments of three reservoirs were similar (without significant differences) and did not reflect the trophic state of the reservoirs.

A comparison between the water quality of the main tributaries to three submontane dam reservoirs and the sediment quality in those reservoirs